File California Form 540X
Prepare Form 540X now with TaxAct
California Form 540X is a tax return document for residents who need to amend their previous return. Also known as the amended individual tax return form, it is used to correct any errors in income, reimbursements or tax credits on a number of other California 540 tax documents. When filling out your 540X form, you will be given the chance to explain why you are making an amendment in your tax return.